/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.el;

import org.apache.el.lang.ELSupport;
import org.apache.el.lang.ExpressionBuilder;
import org.apache.el.util.MessageFactory;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;

/**
 * @author Jacob Hookom [jacob@hookom.net]
 * @see javax.el.ExpressionFactory
 */
public class ExpressionFactoryImpl extends ExpressionFactory {

	/**
	 *
	 */
	public ExpressionFactoryImpl() {
		super();
	}

	@Override
	public Object coerceToType(Object obj, Class<?> type) {
		return ELSupport.coerceToType(obj, type);
	}

	@Override
	public MethodExpression createMethodExpression(ELContext context,
	                                               String expression, Class<?> expectedReturnType,
	                                               Class<?>[] expectedParamTypes) {
		ExpressionBuilder builder = new ExpressionBuilder(expression, context);
		return builder.createMethodExpression(expectedReturnType,
				expectedParamTypes);
	}

	@Override
	public ValueExpression createValueExpression(ELContext context,
	                                             String expression, Class<?> expectedType) {
		if (expectedType == null) {
			throw new NullPointerException(MessageFactory
					.get("error.value.expectedType"));
		}
		ExpressionBuilder builder = new ExpressionBuilder(expression, context);
		return builder.createValueExpression(expectedType);
	}

	@Override
	public ValueExpression createValueExpression(Object instance,
	                                             Class<?> expectedType) {
		if (expectedType == null) {
			throw new NullPointerException(MessageFactory
					.get("error.value.expectedType"));
		}
		return new ValueExpressionLiteral(instance, expectedType);
	}
}
